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I think I found where the error is.

You wrote : ? The S1P files contains the real and imaginary parts of the reflection coefficient, Greek letter ‘gamma’. ?

But S11 is not the equivalent of gama.

We did everything to complicate this matter of reflection coefficient starting with the identifier:

- Either with the Greek letter gamma when it has a complex value like A+jB
- Either with the Greek letter rho ρ when using the module

We will use a synonymous identifier: S11 which comes from the S parameters of a quadripole. It should say "S one one" but "S eleven" is common. We will not dwell on the parameters S which find their origin in the matrix calculation. The interest of this synonym is that:
? If we talk about the complex value we write S11
? If we talk about the module we write |S11| remembering that :
? nanovna-saver displays this parameter |S11|
? nanovna-saver saves S11

It is in fact the reduced coefficient because we will retain as definition
If Z = A + jB

Then

z = Z/Zc = A/Zc + j B/Zc

in most cases Zc = 50

S11 = (z-1)/(z+1)

To complicate everything, we invented the ROS (which some unfortunately still call the TOS, as in the bottom of many Smith charts) while it is almost impossible to know this relationship between the maximum and minimum voltage generated by a standing wave

ROS = (1 + |S11|) / (1-|S11|)
And
|S11| = (ROS-1)/(ROS+1)

In everyday life: VSWR = SWR = ROS so we avoid talking about TOS, it's simpler

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F1AMM Fran?ois